Direct-acting pump.



PATENTED JAN. 3, 1905l J. T. JBNNINGS & T. H. C. HOMBRSHAM.

DIRECT ACTING PUMP.

APPLIGATION FILED JULY 20,1905.

SHEETS-snm 1.

Afro/@Ways No.7'79,044. PATENTED JAN. 3, 1905.

J. T. JENNINGS & T. H. C. HOMBRSHAM.

DIRECT ACTING PUMP. APPLIOATION FILED JULY 20,1905.

2 SHEETS-SHEET 2.

Marpa.; C. #wma/Jian No, I779,044.

llNiTED STATES Patented January 3, 1905.

PATENT EEicE.

JOHN T. JENNINGS AND THOMAS H. C. HOMERSHAM, OF BRADFORD, ENGLAND.

DIRECT-ACTING PUMP.

SPECIFICATION formingpart of Letters Patent No. 779,044, dated January 3, 1905.

Application filed July 20, 1903. Serial No. 166,334.

To LH whom it may concern.'

Be it known that we, JOHN THOMAS .IEN- NINGs and THOMAS HENRY COLLETT HOMERs- HAM, subjects of the King of Great Britain and Ireland, whose postal address is Vulcan Iron Works, Bradford, in the county of York, England, have invented certain new and useful Improvements in and Relating to Direct- VActing Pumps, of which the following is a specification.

This invention relates to improvements in direct-acting pumps, used principally for eX- hausting the water and vapor of condensation from steam-engines, but suitable for pumping any fluid, and in which the motive power is derived from steam or other fluid pressure, and has for its object the construction of the pump-barrel' in such a manner that a simple and positive action is obtained.

In describing our invention in detail reference is made to the accompanying sheets of drawings, similar letters indicating similaiparts, in which- Figure l is a sectional elevation of a pum pbarrel. Fig. 2 is a sectional elevation of the pump-barrel and one of the valves, showing a modification. Fig. 3 is a plan view of the barrel and valves. Fig. 4 is a sectional View through the valves.

1n carrying out our invention in the pumpbarrel A of a direct-acting pump are formed grooves B, Fig. 1, or ports C, Fig. 2, such grooves B or ports C reaching to the counterbore of the pump-barrel A, arranged in such a mannerthat when the plunger D is nearing the end of its stroke in either direction the grooves B or ports C form a connection between the spaces adjacent to the face of the plunger D and allow some of the liuid which is being pressed upon by the said plunger to escape to the opposite side of such plunger. Ports E andF act as both inlet and outlet ports, and each port is connected to a valvechamber having therein ordinary check-valves 4 5, one opening inward for inlet and the other to outward for outlet, such valves being connected, respectvely,to inlet and outlet pipes-that is to say, there are two valvechambers l 2, separated by a plate 3 or other suitable means absolutely of ordinary description. One of these valve-chambers, l, communicates with the top port E and the other, 2, with port F. As this part of the device is well known and outside of our invention, we have not described it in detail. Piston D is worked from a cylinder (not shown) placed above and containing a piston attached to the plunger-rod D and actuated by steam-pressure. By this means the passages allow the fluid to pass from one side to the other of the plunger, and so cause a reduction in resistance to the said plunger, and thus the speed of the plunger-rod and piston of the steamcylinder is accelerated, and the momentum thus obtained is applied to positively actuate the valve controlling the supply of steam to the steam-cylinder.

Our invention resides wholly in the grooves by which the liuid can pass from one side of the plunger to the other when the plunger nears the end of its stroke in either direction, thus reducing the resistance usually offered at this point to pump-plunger, and the grooves B or ports O can be applied in suitable form to any type of direct-acting pump driven by eXpansible Huid under pressure, and we have not, therefore, shown the mechanism for operating the pump.

What we claim as our invention is- In direct-acting pumps, a pump-barrel having closed ends,a piston therein and annularlyarranged passages in the interior walls of the barrel near each end thereof, whereby when the piston is nearing its stroke in either direction the barrel on each side of the piston is in communication substantially as described.

l In witness whereof we have hereunto set our hands in the presence of two witnesses.

J. T. JENNINGS. T. H. C. HOMERSHAM.

Witnesses:

A. W. Pos'rLETHWArrE, EVE WAUGH. 

